CN102512910B - Smoke heat exchange process for recycling evaporated water of gas desulfurization system - Google Patents
Smoke heat exchange process for recycling evaporated water of gas desulfurization system Download PDFInfo
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- CN102512910B CN102512910B CN 201110374732 CN201110374732A CN102512910B CN 102512910 B CN102512910 B CN 102512910B CN 201110374732 CN201110374732 CN 201110374732 CN 201110374732 A CN201110374732 A CN 201110374732A CN 102512910 B CN102512910 B CN 102512910B
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Abstract
The invention discloses a smoke heat exchange process for recycling evaporated water of a gas desulfurization system. The smoke heat exchange process comprises the following steps of: outlet smoke cooling, original smoke cooling and outlet smoke heating, wherein underground water or industrial water is used as a heat exchange medium, the heat exchange medium is subjected to primary heat exchange together with outlet smoke exiting from an absorption tower of the gas desulfurization system so as to cool and dewater the outlet smoke, smoke condensed water generated after the primary heat exchange is subjected to precipitation through a settling pond so as to be recycled by the gas desulfurization system, the heat exchange medium subjected to the primary heat exchange is subjected to secondary heat exchange with original smoke entering the absorption tower of the gas desulfurization system so as to cool the original smoke, the heat exchange medium subjected to secondary heat exchange is used for heating air so as to carry out tertiary heat exchange, and then enters into the gas desulfurization system so as to be recycled, and the heated air is mixed with the outlet smoke subjected to the primary heat exchange so as to be used as purified smoke for emission. Compared with the conventional smoke heat exchange system, the smoke heat exchange process has the advantages of remarkably reducing the smoke water content and the dust content, greatly reducing the operation cost, recycling the smoke condensed water, and being high in heat utilization rate.
Description
Technical field
The present invention relates to coal-burned industrial boiler stove and Flue Gas Desulfurization Technology of Power Plant, specifically a kind of flue gas heat exchange technique of desulphurization system evaporation water recycling.
Background technology
In the wet desulfurization system, the washing process of the hot flue gas in the spray column needs the evaporation large quantity of moisture, and this is so that the fresh water (FW) consumption of desulphurization system is very large.Simultaneously, in actual use owing to demister except reasons such as the restriction of fog effect, fluctuation of operating conditions, mist eliminator flushings, absorption tower outlet flue gas generally contains part water droplet and slurries.A large amount of water vapours enter atmosphere by the outlet flue gas, have increased the water consumption of desulphurization system, and simultaneously, the part slurries that carry in the flue gas are taken out of with flue gas, will increase outlet exhaust gas dust content.In addition, in exhaust pass, because drop bump walling of flue and cooling condensation cause flue part ponding, because this part drop is acid, will cause larger corrosion to flue and follow-up equipment.
For avoiding the exhaust pass corrosion, usually adopt smoke re-heater (GGH) to improve exit gas temperature, to prevent flue gas with water condensate corrosion exhaust pass, but because GGH easily stops up, most of desulfurization project are abandoned, and simultaneously, absorption tower outlet flue gas is after heating up, the slurries drop that it carries will still be present in the flue gas, increase dust content in the flue gas.
Summary of the invention
The present invention is directed in the above-mentioned existing desulphurization system problems such as the fresh water (FW) consumption is large, equipment corrosion, a kind of flue gas heat exchange technique of utilizing water to recycle as the desulphurization system evaporation water of heat transferring medium is provided.
The flue gas heat exchange technique that a kind of desulphurization system evaporation water is recycled, comprise that outlet flue gas cool-down, former flue gas cool-down and outlet flue gas heat up, adopt underground water or other water for industrial uses as heat transferring medium, heat transferring medium carries out the heat exchange of I level with the outlet flue gas that goes out the desulphurization system absorption tower, the outlet flue gas cool-down is dewatered, and the flue gas condensing water that produces after the heat exchange of I level is used for desulphurization system slurry, mist eliminator flushing, filter cloth washing etc. after precipitation; Heat transferring medium after the heat exchange of I level carries out the heat exchange of II level with the former flue gas that enters the desulphurization system absorption tower, and former flue gas is lowered the temperature; Heat transferring medium after the heat exchange of II level heats air and carries out the heat exchange of III level, then enters desulphurization system and is used for changing slurry, mist eliminator flushing, filter cloth washing etc.; Air after III level heat exchange heating mixes with the outlet flue gas after the heat exchange of I level, as clean fume emission; The place arranges steam pipework at III level heat exchanger, when cause when the coolant-temperature gage of II level heat exchange hangs down III level heat exchanger being carried out thermal compensation owing to former flue-gas temperature fluctuation.
Described former flue gas is after II level heat exchange cooling, and temperature preferably is controlled at less than 120 ℃.
The outlet flue gas on described desulphurization system absorption tower is after the air Hybrid Heating, and temperature preferably is controlled at more than 70 ℃.
Droplet content is less than 50mg/Nm in the described clean flue gas
3
Technique of the present invention will go out first the outlet flue gas cool-down on desulphurization system absorption tower, and the most of drop in the flue gas removes by condensation, and it is recycled, and adopt the method for sneaking into hot-air in the outlet flue gas that the outlet flue gas is heated again.Compare tradition only to the technique of outlet flue gas, technique provided by the invention can greatly reduce desulphurization system water consumption, with 2 * 300MW fired power generating unit, 2000000Nm
3/ h exhaust gas volumn, 50 ℃ of calculating of exit gas temperature, if exit gas temperature is down to 40 ℃, saturated vapor condensation water quantity 50t/h nearby only.In addition, than adopting GGH directly to heat the technique of outlet flue gas, method provided by the invention dewaters more thorough, also can solve because the higher problem of outlet exhaust gas dust content that flue gas band slurry causes, simultaneously, the method heating outlet flue gas of hot-air is sneaked in employing, has avoided the susceptible to plugging problem of similar GGH.
The advantage of technique of the present invention is: adopt water as heat transferring medium, utilize the heat heating outlet flue gas that absorbs from former flue gas, improved heat utilization rate; Outlet flue gas condensing water is recycled after the preliminary sedimentation tank precipitation, adds water behind the hot-air and also enters desulphurization system and carry out reuse, has avoided water resource waste.
Description of drawings
Fig. 1 is the device schematic diagram of process implementing example of the present invention.
1-I level heat exchanger, 2-II level heat exchanger, 3-III level heat exchanger, 4-gas mixer, 5-sedimentation basin, 6-absorption tower
The specific embodiment
The present invention adopts device as shown in Figure 1, implementation is as follows: adopt water as heat transferring medium, carry out the heat exchange of I level by I level heat exchanger 1 and the outlet flue gas that goes out desulphurization system absorption tower 6, the outlet flue gas is lowered the temperature and dewatered, and the flue gas condensing water that produces after the heat exchange of I level enters desulphurization system and is back to desulphurization system slurry, mist eliminator flushing, filter cloth washing etc. after sedimentation basin 5 precipitations; Water after 1 heat exchange of I level heat exchanger enters II level heat exchanger 2, lowers the temperature to entering absorption tower 6 former flue gases; Water through 2 heat exchange of II level heat exchanger enters III level heat exchanger 3, and air is heated, and then enters desulphurization system and is used for changing slurry, mist eliminator flushing, filter cloth washing etc.; Air after the heating mixes with the outlet flue gas by gas mixer 4, as clean fume emission; The place arranges steam pipework at III level heat exchanger, when cause carrying out thermal compensation, to satisfy the exit gas temperature requirement when the coolant-temperature gage of II level heat exchange hangs down owing to former flue-gas temperature fluctuation.
Claims (7)
1. the flue gas heat exchange technique recycled of a desulphurization system evaporation water, it is characterized in that step is as follows: heat transferring medium and the outlet flue gas that goes out the desulphurization system absorption tower are carried out the heat exchange of I level, the outlet flue gas cool-down is dewatered, and the flue gas condensing water that produces after the heat exchange of I level is back to desulphurization system after precipitation; Heat transferring medium after the heat exchange of I level carries out the heat exchange of II level with the former flue gas that enters the desulphurization system absorption tower, and former flue gas is lowered the temperature; Heat transferring medium after the heat exchange of II level heats air and carries out the heat exchange of III level, and the heat transferring medium after the heat exchange of III level enters the desulphurization system reuse; Air after the heating mixes with outlet flue gas after the heat exchange of I level, as clean fume emission.
2. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1, it is characterized by: described heat transferring medium is underground water or water for industrial use.
3. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1 is characterized by: increase steam pipework in the heat exchange of described III level and vulcanize and taste.
4. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1, it is characterized by: the outlet flue gas on described desulphurization system absorption tower is after the air Hybrid Heating, and temperature is more than 70 ℃.
5. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1, it is characterized by: described former flue gas is after II level heat exchange cooling, and temperature is less than 120 ℃.
6. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1, it is characterized by: the air after described III level heat exchange heating, temperature is greater than 85 ℃.
7. the flue gas heat exchange technique recycled of desulphurization system evaporation water according to claim 1, it is characterized by: droplet content is less than 50mg/Nm in the described clean flue gas
3
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| CN 201110374732 CN102512910B (en) | 2011-11-23 | 2011-11-23 | Smoke heat exchange process for recycling evaporated water of gas desulfurization system |
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| CN 201110374732 CN102512910B (en) | 2011-11-23 | 2011-11-23 | Smoke heat exchange process for recycling evaporated water of gas desulfurization system |
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| CN102512910A CN102512910A (en) | 2012-06-27 |
| CN102512910B true CN102512910B (en) | 2013-10-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536456A (en) * | 2016-01-13 | 2016-05-04 | 北京亿盛源电力技术有限公司 | Wet desulphurization and flue gas emission system and method thereof |
| CN105833688B (en) * | 2016-05-06 | 2018-03-02 | 山东岱荣节能环保科技有限公司 | The energy-saving clean tapping equipment of coke oven underground flue gas |
| CN106669342A (en) * | 2017-01-09 | 2017-05-17 | 南京龙源环保有限公司 | Novel demisting system |
| CN106693641A (en) * | 2017-01-25 | 2017-05-24 | 浙江环兴机械有限公司 | System integrating with waste heat recovery, dedusting, deodorization, desulfurization, denitration and white smoke removing and treating method of system |
| CN112933902B (en) * | 2021-01-28 | 2021-11-16 | 广东科洁环保工程技术有限公司 | Sintering flue gas desulfurization denitration waste heat utilization equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887412A (en) * | 2005-06-28 | 2007-01-03 | 王宇 | Method of preventing wet desulfurized fume from dewing corrosion |
| CN201164790Y (en) * | 2008-01-22 | 2008-12-17 | 王敏 | Gas-liquid contact non-phase-change intermediate medium heat exchange wet-type desulfurizer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887412A (en) * | 2005-06-28 | 2007-01-03 | 王宇 | Method of preventing wet desulfurized fume from dewing corrosion |
| CN201164790Y (en) * | 2008-01-22 | 2008-12-17 | 王敏 | Gas-liquid contact non-phase-change intermediate medium heat exchange wet-type desulfurizer |
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